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Predictive Power Control of a DFIG Driven by a Back-to-Back Three-Level Neutral-Point Clamped Converter

Gonçalves, P. F. C. ; Cruz, S. M. A. ; Caseiro, L. ; Bandarabadi, M. ; Mendes, A. M. S.

Predictive Power Control of a DFIG Driven by a Back-to-Back Three-Level Neutral-Point Clamped Converter, Proc IEEE International Electric Machines & Drives Conference (IEMDC), Miami, FL, United States, Vol. , pp. 1 - 7, May, 2017.

Digital Object Identifier: 10.1109/IEMDC.2017.8002105

Abstract
This paper proposes a new fault-tolerant predictive control strategy, with minimal hardware requirements, for wind energy conversion systems based on the doubly-fed induction generator with the rotor fed by two three-level neutral-point clamped converters in a back-to-back configuration. The proposed strategy is capable of maintaining the system in operation with good performance under IGBT open-circuit and short-circuit faults in both converters simultaneously, thus reducing the wind turbine downtime and maintenance costs. Under the presence of an IGBT fault, the proposed fault-tolerant approach simply discards the switching states that cannot be applied due to the fault or that put at risk the remaining healthy power switches of the converters, taking advantage of the versatility of finite control set model predictive control, without requiring the use of complex modulation techniques. In the case of IGBT open-circuit faults, a dc-link midpoint connection along with switching state
limitation is performed to isolate the faulty legs of the converters. The effectiveness of the proposed fault-tolerant strategy for IGBT faults in both converters, is validated with simulation results.